Add support for system ID of position controller #30349

Job	Run time
build (chibios, Durandal)	18m 55s
build (chibios, MatekF405)	16m 30s
build (chibios, KakuteF7)	15m 20s
build (chibios, MatekH743-bdshot)	12m 48s
build (chibios, Pixhawk1-1M)	17m 19s
build (chibios, MatekF405-CAN)	2m 12s
build (chibios, DrotekP3Pro)	1m 51s
build (chibios, Hitec-Airspeed)	2m 4s
build (chibios, f103-GPS)	2m 19s
build (disco, armhf)	9m 43s
	1h 39m 1s

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